On Friday, April 14, 2017 at 10:07:57 AM UTC-7, AMuzi wrote:
On 4/14/2017 11:33 AM, jbeattie wrote:
On Friday, April 14, 2017 at 7:27:06 AM UTC-7, AMuzi wrote:
On 4/14/2017 9:14 AM, Art Shapiro wrote:
On 4/14/2017 5:35 AM, AMuzi wrote:

Original handlebar clamp bolts are Grade 8; readily
available and cheap.
Grade 5 may be strong enough but for pennies difference I
suggest an 8.

How does one get these "readily available" Grade 8 guys?
Deda doesn't seem to have much of a web presence outside of
Italy. Is this a generic item stocked by a good LBS?


Any metric fastener supplier if not your local hardware store.

https://duckduckgo.com/?q=DIN+912+grade+8&t=ha&ia=web

My neighborhood hardware store has them: http://aboysupply.com/wp-content/upl...1024x415_c.png They have a crazy selection of fasteners.

By the way, what's the deal with thread pitch? I always worry I'm getting the wrong pitch, but I guess that the whole "standard/fine/extra fine" thread pitch only kicks in with fasteners over 8mm(?). Otherwise, it's a pre-set. Right?



There are/were indeed other pitches available (the French
metric m5x0.9 for example) but the DIN standard (m5x0.8,
m6x1 etc) is well established now.

In my experience that's more of a problem with SAE fasteners
(1/4-20, 1/4-28 etc). Prior systems such as AC/AF, UNC/UNF,
Whitworth have become rare and unusual.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971

I am horrified that anyone would need a Grade 8 bolt for a stem. I would get a stem that uses two stainless bolts to clamp to the steerer and four to clamp to the bar. I would assume that he is discussing an MTB because I can't imagine conditions bad enough on a road to pop a grade 8 bolt under any forces there.